The Islamic State extremist from the U.K. known as “Jihadi John” for his roles in videotaped executions of hostages was the target of a U.S.-led airstrike in Syria, though British Prime Prime Minister David Cameron said it’s not yet clear if he was killed. Speaking on Friday, Cameron said the operation was “an act of self defense” that showed the “long reach” of Britain and the U.S. in their fight against Islamic State. The man, Mohamed Emwazi, was the focus of a U.S. drone strike on a vehicle near Raqqah, Syria.